This is a nice pair of Agnostid trilobites. These are Perenopsis interstrictus from the Cambrian of Utah. These trilobites are complete and exhibit fine detail. The isopygous cephalons and pygidiums are beautifully displayed. The bugs have very good color and contrast and are well showcased on the large plate of shale. This is a great example of two blind, two-segmented trilobites from the Wheeler Formation.